Mark James created a great set of 1,022 silky-smooth 16x16 true-colour
icons in PNG format, aptly named Silk Icons.

Introducing the Silk Companion II Icon Pack.
While developing a new CKEditor skin for GetSimple, I had a need for some extra Silk icons developed by Mark James at FamFamFam.
Out came 64 new silk-inspired icons. These icons are released under the same Creative Commons Attribution 3.0 License as the originals.